Did anyone notice that one of the gun regulations that Trump got rid of was the one banning mentally ill people from buying guns?
He's so hell bent on getting rid of everything Obama that he's actually gotten rid of some stuff that actually makes sense.
I know being reasonable is not part of your make up, but what Trump got rid of was a regulation that people on social security who met two main criteria: a) They were receiving full disability benefits because of a mental illness and couldn't work and b) they were unable to manage their own benefits, thus needing the help of a third party to do so.
It's also not clear -- and perhaps unlikely -- that the man accused of terrorizing the high school in Parkland and killing 17 people there would have met either of the criteria laid out to be reported under that rule.
What's more, the rule Trump rescinded was opposed by the American Civil Liberties Union. So, your complaint is ridiculous.